(Very) Hard AND nice puzzles
The following list contains portal puzzles that have been rated as nice or very nice and that are difficult. These puzzles are recommended for experts - and allow some time to solve.
| Description | solved | Rating | |
|---|---|---|---|
 | Portal Sum - Little Killer Sudoku by Playmaker6174 (on 22. April 2022, 16:46) | 22 |  96 % |
| Martytram Snake by Prof.Dori (on 6. June 2024, 15:38) | 21 | 91 % |
| Nestification Jigsaw 2 by Lyun Licuss (on 29. August 2024, 19:51) | 12 | 93 % |
| The Greatest Hits by juggler (on 20. October 2025, 11:31) | 38 | 91 % |
| RGB by Qodec (on 11. September 2021, 14:17) | 83 | 97 % |
| Kurodoku by yttrio (on 27. July 2024, 02:27) | 114 | 98 % |
| Unresolved Differences by Scruffamudda (on 29. March 2023, 05:47) | 33 | 94 % |
| The Three Bears Sudoku by dance1211 (on 14. October 2020, 03:48) | 23 | 97 % |
| Tumbleweeds by djorr (on 6. September 2021, 14:00) | 20 | 97 % |
| Beacon Lighthouse (Chaos Construction - Phistomefel Tribute) by purpl (on 12. December 2021, 21:38) | 19 | 94 % |
| Chock-a-Block by marty_sears (on 14. May 2024, 01:46) | 85 | 97 % |
| Dutch Dominoes by Black_Doom (on 29. May 2024, 07:55) | 18 | 97 % |
| Revivify by Jay Dyer (on 12. July 2025, 11:20) | 81 | 93 % |
| Ereignisreiches Rätseljahr by Zzzyxas (on 31. December 2013, 06:00) | 26 | 97 % |
| Für Rollo zum Geburtstag: Speichenrätsel by CHalb (on 23. June 2017, 23:58) | 32 | 95 % |
| Sliced Chaos Production by RockyRoer (on 27. November 2022, 12:37) | 48 | 98 % |
| Bunte Geburtstagstorte by Luigi (on 4. November 2014, 00:56) | 31 | 96 % |
| Anti-Knight Arrow Sudoku by MeloMania! (on 29. October 2020, 16:23) | 20 | 91 % |
| Snake Parents by lepton (on 21. January 2023, 07:25) | 17 | 96 % |
| Suradewoku (Geradeweg/Sudoku) by Wessel Strijkstra (on 14. July 2023, 01:39) | 19 | 98 % |
